DOI: 10.5194/tc-8-487-2014
Scopus记录号: 2-s2.0-84896965905
论文题名: Evaluation of the snow regime in dynamic vegetation land surface models using field measurements
作者: Kantzas E ; , Quegan S ; , Lomas M ; , Zakharova E
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 487
结束页码: 502
语种: 英语
英文关键词: accuracy assessment
; annual variation
; climate change
; climate modeling
; density
; land surface
; optimization
; simulation
; snow cover
; vegetation cover
; USSR
英文摘要: An increasing number of studies have demonstrated significant climatic and ecological changes occurring in the northern latitudes over the past decades. As coupled Earth-system models attempt to describe and simulate the dynamics and complex feedbacks of the Arctic environment, it is important to reduce their uncertainties in short-term predictions by improving the description of both system processes and its initial state. This study focuses on snow-related variables and makes extensive use of a historical data set (1966-1996) of field snow measurements acquired across the extent of the former Soviet Union to evaluate a range of simulated snow metrics produced by several land surface models, most of them embedded in IPCC-standard climate models. We reveal model-specific failings in simulating snowpack properties such as magnitude, inter-annual variability, timings of snow water equivalent and evolution of snow density. We develop novel and model-independent methodologies that use the field snow measurements to extract the values of fresh snow density and snowpack sublimation, and exploit them to assess model outputs. By directly forcing the surface heat exchange formulation of a land surface model with field data on snow depth and snow density, we evaluate how inaccuracies in simulating snow metrics affect soil temperature, thaw depth and soil carbon decomposition. We also show how field data can be assimilated into models using optimization techniques in order to identify model defects and improve model performance. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74874
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Centre for Terrestrial Carbon Dynamics, National Centre for Earth Observation, University of Sheffield, Hicks Building, Hounsfield Rd, Sheffield S37RH, United Kingdom; Centre Nationale de la Recherche Scientifique (CNRS), Laboratoire d'etudes en Geophysique et Oceanographie Spatiales (LEGOS), Universite Paul Sabatier Toulouse III, 14, avenue Edouard Belin, 31400 Toulouse, France
Recommended Citation:
Kantzas E,, Quegan S,, Lomas M,et al. Evaluation of the snow regime in dynamic vegetation land surface models using field measurements[J]. Cryosphere,2014-01-01,8(2)